Everyone says that you should only care about having an exact pH with wild caught fish. While if it is captive bred it will adapt to different pHs, all of this makes me wonder: 1- If this is true how in the world were wildcaught fish like angel fish and discus able to be kept in the past (Im talking like in the 20s when fishkeeping was supposedly primitive...)? 2- If it was achieved by somehow giving them a good pH how were their sons able to adapt to a wider range of pH if they were still being kept at their natural pH? I have been countless of times to many mountains, rivers and streams near where I live and I know some people in towns close to the rivers and streams so I thought it would be cool to set up some big kiddy pools or plastic tubs at my yard and try to breed wild caught fish, I was specially interested in Ameca Splendens, seeing how many times I have been to Ameca (they were thought to be extinct but a small population was found, unless I am higly outdated...)and how the fish is endangered. Of course I would first need to get some fundings going (AKA get a job) so this will not probably happen in the near future but I was wondering how would I go about the pH.